What is 'Friction Loss'?

What is 'Friction Loss'?

Frictional loss is a term used to describe the resistance incurred when pushing water through a pipe or flexible hose.  The more water you try to pass through a hose, the more frictional resistance you will incur and the less flow you are likely to see coming out at the end.  Allowing for frictional losses is really important and is frequently ignored or misunderstood but makes the difference between lots of lovely flow coming down your stream and absolutely nothing at all.!  

The 1st thing to consider is the diameter of the hose. It’s important to use the largest hose diameter you can, as this will keep the frictional resistance to a minimum. A good guide to follow is to use the largest hose that the manufacturer suggests for the pump chosen (i.e. the largest step on the hose-tail adaptor supplied with the pump).  

Also, try and keep the length of hose as short as possible as for every metre of hose you have in transit, you will incur more losses so try and take the shortest route between the pump and the point of discharge.

Finally, try to avoid the use of cheap 'Aquatic Hose'.  The ribbed internals cause the water to incur severe losses due to turbulence and this also has a habit of degrading quickly which could lead to a fracture, emptying your entire pond.  Water Garden only supply high quality, smooth bore flexible hose to ensure long service life and keep losses to an absolute minimum.

Here at Water Garden, we have special charts which allow us to calculate and account for flow losses so do contact us to help. Ultimately, using a larger hose often means that the pump selected can be smaller (i.e. lower energy consumption) and also cheaper to purchase - important stuff if you are paying the bills.!

Friction Loss

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